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The stability of the high performance thermoelectric β‐Zn4Sb3 is investigated by multi‐temperature high resolution synchrotron powder X‐ray diffraction. Contrary to previous claims β‐Zn4Sb3 is not stable when heated in argon and degradation is observed already at 500 K. Nevertheless, the thermal stability of β‐Zn4Sb3 is much improved in argon (ca. 5 wt.‐% degradation after three heating cycles to...
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